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Additional resources for Above the clouds : managing risk in the world of cloud computing

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No virus can penetrate the golden image so each virtual session will erase any viruses or malware that manages to infect any previous sessions. This reduces the effectiveness of the attack because the infection does not last as long in a virtual desktop environment. One such virtual desktop vendor is Citrix ® . Citrix ® is designed to host a Windows ® or Linux ® desktop accessible via a web browser. The desktop work is performed in the Cloud data center; the web client communicates screen updates from the remote machine back to the browser, and remote keystrokes and mouse clicks back to the host system.

Virtualization software allows for a single application server to be broken into fractional replicas called virtual machines. The software allows for granular control of processing resources and can reallocate processing power between virtual machines based on demand. This feature also allows each virtual machine to appear to have a unique configuration, list of authorized users, and identity. This configuration runs more efficiently than a single stand­ alone server that might be limited to a single set of users and one configuration.

When you share systems among more users, the utilization can increase dramatically. According to Intel®, the performance gain from a server refresh that consolidates workload versus systems that were in place four years ago is 10:1. By using a shared service model, more users can access the same system and the idle capacity is reduced. This means that: • You won’t have to grow the data center at the same pace. • Less power will be consumed. • There will be less of an impact on the environment. • Surge capacity will be available as needed.